Zhongjie's special outfit is gaining momentum! Building a first-class green energy equipment manufacturing industrial park in China, with a focus on Shandong's industrial development

Recently, the online theme promotion activity of "Number in 'New' - Decoding New Industrialization" visited Shandong Zhongjie Special Equipment Co., Ltd. (hereinafter referred to as "Zhongjie Special Equipment") to see how they use pressure vessels to drive a large industry with an annual output value of nearly 1 billion yuan.

In the production workshop of Zhongjie Special Equipment, steel plates are cut, welded, polished, and sprayed into pressure vessels of different specifications. Large tank bodies are arranged in the open-air finished goods warehouse, waiting to be loaded and shipped.

This is our company's main product. Currently, the company has many orders, busy production, and heavy tasks. Workers are working at full speed to fulfill orders and ensure the completion of customer delivery tasks. "According to Li Chuanjie, General Manager of Zhongjie Special Equipment Business Center, in recent years, Zhongjie Special Equipment has seized the opportunity of the dual carbon strategy and focused on high-end green energy equipment. It has developed more than 100 specifications and models of new energy equipment products, including pressure vessels for carbon dioxide and compressed air energy storage, pressure vessels for carbon dioxide capture, recovery and storage, liquefied petroleum gas storage tanks, and liquid ammonia storage tanks. Among them, the market share in the sub field of ultra-low temperature pressure vessel carbon dioxide capture, recovery and utilization has reached 31.1%, ranking first in China in terms of market share.

It is understood that welding is the core technology in the manufacturing of low-temperature pressure vessels. In the past, low-temperature product welding processes used methods such as landfill arc welding and handle welding. The weakest link in low-temperature vessels - the welded joint - has uneven chemical composition, microstructure, and mechanical properties, resulting in significant differences in micro strain strengthening effects in different areas of the joint. This affects the quality stability and safety of cryogenic vessel products, and has become a bottleneck restricting the manufacturing capacity of low-temperature pressure vessels.

To this end, the Zhongjie Special Equipment Technology Team, together with Professor Li Yajiang's team from Shandong University, has taken the lead in conducting research on the key technologies of plasma arc+wire filling argon arc combined welding and strain strengthening in China. By conducting correlation studies on the mechanical properties and microstructural evolution of strain strengthening PAW-GTAW combined welding joints, the first application of PAW+GTAW combined welding and strain strengthening technology in ultra-low temperature container manufacturing has been achieved. The welding is formed in one go, the production efficiency is greatly improved, and the welding strength is greatly enhanced. On the premise of using steel plate thickness, the product can be reduced by 30%, achieving lightweighting. According to relevant institutions, this technology not only fills the domestic gap, but also reaches the international advanced level.